Saw this on Salmon University web site:

Q: John, I was just looking at the Powerpro Line website and they suggested using their line for downrigger cable. Have you ever tried this? What results did you have? They stated it would eliminate downrigger hum. Other then not being able to hook up the black box do you see any harm? Thanks. Chad

A: Chad,
1. It will void the warranty on your downrigger
2. It can cause the wire spool to split open
3. On a Scotty you can not attach the stopper bead
4. It does not wear well
I don't recommend it. Downrigger hum is a good thing, it means you're trolling at a good speed.
Capt. John Keizer